AP03 VTEC Solenoid for Variable Valve Timing system compatible with engine models B16 B17 B18c B18c1.Part number 15810P30005.Designed to regulate oil flow to the VTEC mechanism, enabling variable valve timing.Installs directly into the engine's valvetrain system.proper engagement of -performance cam profiles at designated RPM ranges.Constructed for durability under continuous engine conditions.Matches specifications for fitment and function. This product is a third-party alternative.Brand/model references are included only to assist with compatibility identification.